The Google Chrome browser has an option "Continue running background apps when Google Chrome is not running." For security reasons you should disable this feature. If you're working in your personal health record (PHR) and forget to sign out, someone else may be able to get back into your PHR if they start using the same computer.
To disable this feature, click on the Google Chrome menu (3 lines in the upper right of your Chrome broswer) and click "Settings". Scroll to the bottom and click on "Show Advanced Settings". Scroll down to the heading "System" and make sure the option "Continue running background apps when Google Chrome is closed" isn't checked.
Always remember to sign out of your MyHealth.Alberta.ca account when you're finished, before closing your browser.